This manual is designed to provide information to interlibrary loan (ILL) practitioners about the philosophy behind interlibrary loan, as well as a functional knowledge of its routines. The first part of the manual presents general and background material about interlibrary loans. Included in this section are a glossary of library terms, the responsibilities of borrowing and lending libraries, information about ILL copyright, costs associated with ILL, and ILL codes, i.e., a set of rules which govern the borrowing and lending activities of interlibrary loan. The second section describes the basic steps necessary to secure a typical loan, including the ILL interview, and presents examples of appropriate forms and descriptions for record keeping and ILL etiquette. Also included in this section are a list of suppliers of library materials and a discussion of ILL administration. Appendixes present information about the Access Pennsylvania Database and provide a sample Access Pennsylvania borrowing form, an in-house request form, an American Library Association (ALA) ILL request form, and a sample filled request. A selected bibliography concludes the manual. (MAB)